don'r run duplicated CI jobs in PR

Author: johnnychen94

.github/workflows/UnitTest.yml

@@ -1,7 +1,14 @@
 name: CI
 on:
-  - push
-  - pull_request
+  create:
+    tags:
+  push:
+    branches:
+      - master
+  pull_request:
+  schedule:
+    - cron: '20 00 1 * *'
+
 jobs:
   test:
     name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}